A:member
B:members
C:the members
D:the member
I'm making progress this term, so I am very proud ________ myself.
下列群落演替系列中,哪一种演替属于初生演替( )
例:
He didn't fly a kite yesterday.
He did his homework yesterday.
水是宝贵的自然资源.请回答下列问题:
(1)下列净化水的方法中,净化程度最高的是____ (填序号)
A.吸附 B.沉淀 C.过滤 D.蒸馏
(2)写出水在生活中的两种应用:____ .
(3)写出生活中节约用水的一种做法:____ .